There's no doubt that those three watches attract the same crowd. But, yes, the GP is big, both in diameter, and height. Also, don't forget GP Constant Force and UN Freak share the same silicium souce, Sigatec.
Most of my watches run large, 42mm+, which is a good case for having something on the sleeker side, some variety.... But, it's also shows that I tend to LIKE larger watches and can wear them, for the most part. I imagine the Freak X clears a cuff very easily?